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# Predicate

`public interface Predicate`
``

java.util.function.Predicate<T>

Represents a predicate (boolean-valued function) of one argument.

This is a functional interface whose functional method is `test(java.lang.Object)`.

## Summary

### Public methods
`default Predicate<T>` | `and(Predicate<? super T> other)` Returns a composed predicate that represents a short-circuiting logical AND of this predicate and another.
`static <T> Predicate<T>` | `isEqual(Object targetRef)` Returns a predicate that tests if two arguments are equal according to `Objects#equals(Object, Object)`.
`default Predicate<T>` | `negate()` Returns a predicate that represents the logical negation of this predicate.
`default Predicate<T>` | `or(Predicate<? super T> other)` Returns a composed predicate that represents a short-circuiting logical OR of this predicate and another.
`abstract boolean` | `test(T t)` Evaluates this predicate on the given argument.

## Public methods

### and

    public Predicate<T> and (Predicate<? super T> other)

Returns a composed predicate that represents a short-circuiting logical AND of this predicate and another. When evaluating the composed predicate, if this predicate is `false`, then the `other` predicate is not evaluated.

Any exceptions thrown during evaluation of either predicate are relayed to the caller; if evaluation of this predicate throws an exception, the `other` predicate will not be evaluated.

Parameters
`other` | `Predicate`: a predicate that will be logically-ANDed with this predicate

Returns
`Predicate<T>` | a composed predicate that represents the short-circuiting logical AND of this predicate and the `other` predicate

Throws
`NullPointerException` | if other is null

### isEqual

    public static Predicate<T> isEqual (Object targetRef)

Returns a predicate that tests if two arguments are equal according to `Objects#equals(Object, Object)`.

Parameters
`targetRef` | `Object`: the object reference with which to compare for equality, which may be `null`

Returns
`Predicate<T>` | a predicate that tests if two arguments are equal according to `Objects#equals(Object, Object)`

### negate

    public Predicate<T> negate ()

Returns a predicate that represents the logical negation of this predicate.

Returns
`Predicate<T>` | a predicate that represents the logical negation of this predicate

### or

    public Predicate<T> or (Predicate<? super T> other)

Returns a composed predicate that represents a short-circuiting logical OR of this predicate and another. When evaluating the composed predicate, if this predicate is `true`, then the `other` predicate is not evaluated.

Any exceptions thrown during evaluation of either predicate are relayed to the caller; if evaluation of this predicate throws an exception, the `other` predicate will not be evaluated.

Parameters
`other` | `Predicate`: a predicate that will be logically-ORed with this predicate

Returns
`Predicate<T>` | a composed predicate that represents the short-circuiting logical OR of this predicate and the `other` predicate

Throws
`NullPointerException` | if other is null

### test

    public abstract boolean test (T t)

Evaluates this predicate on the given argument.

Parameters
`t` | `T`: the input argument

Returns
`boolean` | `true` if the input argument matches the predicate, otherwise `false`

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